Sony-Ericsson T68 Service Manual

Repair instruction, Electrical

Repair instruction T68, Electrical

by Toko ([e-mail])

Contents

1 Explanations .........................................................................................................................2

2 Network Problems................................................................................................................ 2

3 On/Off Problems ..................................................................................................................3

4 Display/Illumination Problems ...........................................................................................3

5 Capacity/Charging Problems..............................................................................................4

6 Key/Joystick Problems........................................................................................................4

7 Alert Problems......................................................................................................................5

8 Data Communication Problems.......................................................................................... 5

9 Software Problems ...............................................................................................................6

10 Revision History ..................................................................................................................6

4/00021-2/FEA 209 544/50 A

 Ericsson Mobile Communications AB

Approved according to 1776-1/FEA 209 544

Repair instruction, Electrical

1 Explanations

For component placing see doc.1078-2/FEA 209 544/50.

The Go / No Go test has to be performed with a mounted phone.

1.1 Service functions in the software

In the software of the phone there is a built in service function that allows testing some of the
functions of the phone.

They are as follows:

1. Service info

2. Service settings

3. Service tests

4. Text labels

To use the functions press the following combination on the keyboard:

► * ◄ ◄ * ◄ *

2 Network Problems

• Check that the antenna flex film is properly fitting and undamaged. (Fig.2.1).

• If necessary replace the antenna flex film.

• Check that the antenna switch J001 (Fig.2.2) not is incorrectly soldered, mechanically

damaged, dirty or oxidised. Measure the resistance trough the antenna switch, it should
be less than 1 Ω, do not press down the antenna switch when measuring.
Clean or re-solder it if needed.

If the fault still remains, handle the unit according to the local company directives.

Fig 2.1 Fig 2.2

4/00021-2/FEA 209 544/50 A

 Ericsson Mobile Communications AB

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Repair instruction, Electrical

3 On/Off Problems

• Check the flex-film for malfunction (Fig.3.1).

If necessary replace it.

• Check that the system connector (Fig.3.2) not is incorrectly soldered, mechanically

damaged, dirty or oxidised.
If necessary replace it.

If the fault still remains, handle the unit according to the local company directives.

Fig 3.1 Fig 3.2

4 Display/Illumination Problems

• If there is problem with the Display function or the Display illumination check that the

LCD-connector H623 (Fig 4.1) not is incorrectly soldered, mechanically damaged, dirty
or oxidised.
If necessary replace it.

If the fault still remains, handle the unit according to the local company directives.

Fig 4.1

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 Ericsson Mobile Communications AB

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Repair instruction, Electrical

5 Capacity/Charging Problems

• Check that the system connector (Fig.5.1) not is incorrectly soldered, mechanically

damaged, dirty or oxidised.
If necessary replace it.

If the fault still remains, handle the unit according to the local company directives.

Fig 5.1

6 Key/Joystick Problems

• Use the Service Test menu, choose Keyboard.

• Make sure if it is the Keyboard or the Joystick that causes the problem.

• If it is the Keyboard that cause the problem, replace the flex film. (Fig.6.1).

• If it is the Joystick that cause the problem, check that S50 (Fig.6.2) not is incorrectly

soldered, mechanically damaged, dirty or oxidised.
Clean, re-solder or replace it if needed.

If the fault still remains, handle the unit according to the local company directives.

Fig 6.1 Fig 6.2

4/00021-2/FEA 209 544/50 A

 Ericsson Mobile Communications AB

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Repair instruction, Electrical

7 Alert Problems

• Use the Service Test menu, choose Buzzer.

• Activate the buzzer using the joystick.

If it sounds low or distorted open the phone and inspect the buzzer (H600) and the buzzer
gasket.
Check the buzzer (Fig.7.1) for faulty soldering joints.
If necessary change the buzzer and the buzzer gasket.

If the fault still remains, handle the unit according to the local company directives.

Fig 7.1 Fig 7.2 Fig 7.3

• Use the Service Test menu, choose Vibrator.

• Activate the vibrator using the joystick.

If it does not vibrate, open the phone and inspect the vibrator (H623) (Fig.7.2) and the
connector springs at the board (Fig.7.3).
If necessary change the vibrator.

If the fault still remains, handle the unit according to the local company directives.

8 Data Communication Problems

• If the customer complains about data communication problem with the Digital camera,

MP3 player or AM/FM receiver, check that the system connector (Fig.8.1) not is
incorrectly soldered, mechanically damaged, dirty or oxidised.
If necessary replace it.

If the fault still remains, handle the unit according to the local company directives.

Fig 8.1

4/00021-2/FEA 209 544/50 A

 Ericsson Mobile Communications AB

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Repair instruction, Electrical

9 Software Problems

• If there are problems with the response of the key board commands and/ or spelling

errors in the menu, that are not related to mechanical damage, make a master reset and
flash the phone with the latest soft ware from EMMA II.

• Checking the software revision can be done in the Service info, see chapter Service

functions in the software.

Chose: Service info / SW information.
The Software revision and date will be shown in the display.

If the fault still remains, handle the unit according to the local company directives.

10 Revision History

Rev. Date Changes / Comments

PA1 2001-06-12 First draft
A 2001-08-16 Title changed from Troubleshooting guide to Repair instruction.

4/00021-2/FEA 209 544/50 A

 Ericsson Mobile Communications AB

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